The UK's most complete GLP-1 guide
Every Question Answered. Every Side Effect Explained.
- How GLP-1 medications work
- Mounjaro vs Wegovy compared
- Injection instructions
- Side effects & solutions
- What to eat on treatment
- FAQs answered
Free tracker included with every download this week
Weight Loss in the Elderly — Safe and Effective Approaches
Weight loss in older adults requires a different approach than younger age groups, as muscle loss, bone density, and medication interactions become important considerations. The NHS recognises that sustainable weight management in later life can improve mobility, reduce joint strain, and support overall health. Whether through lifestyle changes, NHS weight loss programmes, or prescription support, older adults have several evidence-based options available. This guide covers what works, what's safe, and how to get help.
10,000+ calculations today · NHS-aligned thresholds · 100% free
Calculate Your BMI Instantly
Enter your height and weight below. Supports both imperial (stone & lbs) and metric (kg). Results include NHS category, healthy weight range, and ethnicity adjustments.
What Is BMI and Why Does It Matter?
Body Mass Index (BMI) is the most widely used screening tool for assessing whether your weight falls within a healthy range. Used by the NHS, GPs, and weight management services across the UK, BMI provides a quick snapshot of your weight relative to your height. The formula is simple: your weight in kilograms divided by your height in metres squared (kg/m²).
While BMI isn't a perfect measure — it doesn't account for muscle mass, bone density, or fat distribution — it remains the standard first step in identifying potential weight-related health risks including type 2 diabetes, cardiovascular disease, high blood pressure, and certain cancers.
The NHS also recommends adjusted thresholds for people of South Asian, Chinese, or Black African heritage — a BMI of 23 or above is classified as overweight, and 27.5 as obese. Our calculator includes this adjustment as a one-click toggle.
Safe Weight Loss Methods for Older Adults
The NHS recommends that older adults aim for a gradual weight loss of 0.5 kg per week — slower than younger adults — to preserve muscle mass and bone density. gradual weight management in later life can accelerate muscle loss (sarcopenia) and weaken bones, which increases fall risk.
- Dietary approach: Focus on nutrient-dense foods (lean proteins, vegetables, whole grains, healthy fats) rather than extreme calorie restriction. Older adults need adequate protein to maintain muscle — aim for 1.0–1.2g per kg of body weight daily.
- Physical activity: Combine resistance training (to preserve muscle) with cardiovascular activity. Even gentle walking, swimming, or tai chi helps maintain strength and balance.
- Hydration: Older adults have reduced thirst signals; staying well hydrated supports metabolism and appetite regulation.
- Medical supervision: Weight loss in the elderly should be discussed with your GP, especially if you take multiple medications or have existing health conditions.
Use our free BMI calculator above to track your starting weight and set realistic targets with your healthcare team.
Clinically BackedWeight Loss
No appointments. No waiting rooms. Just care — from a UK-regulated online pharmacy.
How It Works
Three simple steps to understand your weight and take action.
Enter your height and weight in our free calculator. Get your BMI, NHS category, healthy weight range, and ethnicity-adjusted thresholds instantly.
If your BMI suggests you're overweight or obese, explore our GLP-1 calculators to project potential weight loss on Mounjaro or Wegovy.
Use our progress tracker to log your weight weekly, visualise your journey with charts, and stay motivated — all stored privately in your browser.
Free Weight Loss Tools & Guides
Everything you need to understand your weight, explore medication options, and track your progress — completely free.
When Prescription Weight Loss May Help Older Adults
Older adults with a BMI of 30 or above, or 27 or above with weight-related health conditions (type 2 diabetes, high blood pressure, heart disease), may be eligible for prescription weight management through NHS specialist services or private assessment. GLP-1 weight loss medications (such as those used in prescription weight loss injections) work by reducing appetite and may support sustainable loss alongside lifestyle changes. However, older adults must be assessed individually for suitability, as medication interactions and age-related factors matter. Your GP can refer you to a tier 3 specialist weight management service to discuss whether prescription support is appropriate.
- Dual GIP/GLP-1 receptor agonist
- Up to 22.5% body weight loss (SURMOUNT-1)
- Weekly injection, dose escalation over 20+ weeks
- Available via private prescription in the UK
- Doses: 2.5mg → 5mg → 7.5mg → 10mg → 12.5mg → 15mg
- GLP-1 receptor agonist
- Up to 15–17% body weight loss (STEP trials)
- Weekly injection, 5-step dose escalation
- NHS & private prescription available
- Doses: 0.25mg → 0.5mg → 1mg → 1.7mg → 2.4mg
Mounjaro vs Wegovy: Head-to-Head
A side-by-side comparison of the two most popular GLP-1 weight loss medications available in the UK.
| Feature | Mounjaro | Wegovy |
|---|---|---|
| Drug class | Dual GIP/GLP-1 agonist | GLP-1 agonist |
| Active ingredient | Tirzepatide | Semaglutide |
| Avg. weight loss | 15–22.5% | 12–17% |
| Key trial | SURMOUNT-1 (2022) | STEP 1 (2021) |
| Max dose | 15 mg weekly | 2.4 mg weekly |
| Escalation period | 20–32 weeks | 16–20 weeks |
| Administration | Weekly injection (pen) | Weekly injection (pen) |
| NHS availability | Private prescription only | NHS & private |
| Approx. private cost | £150–£250/month | £150–£300/month |
| Common side effects | Nausea, diarrhoea, constipation | Nausea, vomiting, diarrhoea |
Data sourced from SURMOUNT-1 and STEP 1 clinical trials. Costs are approximate and vary by provider. Always consult a prescriber.
Am I Eligible for Weight Loss Medication?
In the UK, eligibility for GLP-1 weight loss medications like Mounjaro and Wegovy is based on your BMI and overall health profile.
- BMI of 30 or above (obese)
- Age 18 or over
- No contraindicated conditions
- Committed to lifestyle changes
- BMI of 27 or above
- Plus type 2 diabetes
- Or high blood pressure
- Or obstructive sleep apnoea
Use our BMI calculator to check whether your BMI falls within the eligible range.
How We Built These Tools
Every calculator and guide on myweightcheck is built with accuracy and transparency in mind. Our BMI calculator uses the standard WHO formula with NHS-aligned category thresholds. Our GLP-1 projections are modelled on published clinical trial data from SURMOUNT and STEP studies.
All data stays on your device. We don't require sign-ups, and we don't store your health information on any server. Your progress tracker saves data locally in your browser using localStorage, so only you can see it.
We're based in the UK and our tools are designed specifically for UK users — supporting stone & lbs by default, referencing NHS guidelines, using NICE-approved medication data, and linking to GPhC-registered pharmacies.
Frequently Asked Questions
Common questions about BMI, weight loss medications, and our free UK tools.
Is weight loss safe for people over 65?
Yes, when done gradually and under medical supervision. The NHS supports sustainable weight loss in older adults to reduce joint strain, improve mobility, and lower disease risk. Aim for 0.5 kg per week to preserve muscle. Always discuss weight loss goals with your GP first, especially if you take medications.
How much weight should an older adult lose?
Even a 5–10% reduction in body weight can improve health outcomes — lower blood pressure, better blood sugar control, and reduced joint pain. Rather than a specific target weight, work with your GP to set realistic milestones based on your individual health. Try our GLP-1 weight loss calculator to explore potential outcomes.
Can older adults use prescription weight loss medication?
Some older adults may be eligible for prescription weight loss support if they meet BMI criteria and have a medical assessment confirming suitability. Medications must be prescription-only and require clinical assessment for drug interactions and age-related factors. Discuss options with your GP or a specialist weight management service.
What's the best diet for weight loss in older age?
Focus on balanced nutrition: adequate protein (to preserve muscle), plenty of vegetables and whole grains, healthy fats, and regular meals. Avoid very low-calorie diets unless supervised by a healthcare professional. The NHS Weight Loss Plan and Mediterranean-style eating are evidence-based approaches suitable for older adults.
Should older adults do exercise while losing weight?
Yes. Combine gentle cardiovascular activity (walking, swimming) with resistance training to maintain muscle and bone strength during weight loss. This reduces fall risk and preserves mobility. Start slowly and consult your GP or a physiotherapist, especially if you have existing joint or heart conditions.
Ready to take control of your weight loss journey?
Start with a free BMI check, explore your GLP-1 options, or begin tracking your progress today. No sign-up. No cost. Just results.